Crossword Genius

Gelatin substitute (4)

Ross

I believe the answer is:

agar

'gelatin substitute' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for agar that I've seen before include "found in the sea" , "Food-thickening jelly" , "Medium for growth" , "setter" , "Jelly used in bacteria culture" .)

I've seen this clue in the Penny Press, The Wall Street Journal, the Universal and The Sun.
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